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Combined effect of a direct oral anticoagulant edoxaban and an inhibitor of activated thrombin-activatable fibrinolysis inhibitor on clot lysis

  • Yoshiyuki MorishimaEmail author
  • Chikako Kamisato
  • Yuko Honda
Article
  • 36 Downloads

Abstract

Fibrinolysis is regulated by the thrombin/thrombin-activatable fibrinolysis inhibitor (TAFI) system. Thus, anticoagulants and inhibitors of TAFI are expected to accelerate fibrinolysis. The combined effects of an anticoagulant and a TAFIa inhibitor on fibrinolysis remain unknown. The aim of this study was to evaluate the combined effect of edoxaban, an oral direct factor Xa (FXa) inhibitor, and a TAFIa inhibitor, potato tuber carboxypeptidase inhibitor (PCI) on tissue-type plasminogen activator (t-PA)-induced clot lysis in human plasma in vitro. Pooled human plasma (containing 180 ng/mL t-PA and 0.1 nM thrombomodulin) was mixed with edoxaban and/or PCI. Clot formation was induced by 2.5 pM tissue factor and 4 µM phospholipids and clot lysis time was examined. Plasma plasmin-α2 antiplasmin complex (PAP) concentration was measured as a marker of plasmin generation. Edoxaban or PCI alone significantly shortened the t-PA-induced clot lysis time and plasma PAP concentration. The combination of these compounds significantly accelerated the clot lysis compared with the inhibitors alone. Addition of PCI (0.3, 1, and 3 μg/mL) to 75 ng/mL edoxaban increased plasma PAP concentration compared with edoxaban alone; however, compared with PCI alone only the combination of 0.3 μg/mL PCI + 75 ng/mL edoxaban showed the significant increase in PAP concentration. Concomitant use of an oral direct FXa inhibitor, edoxaban, and a TAFIa inhibitor, PCI, significantly accelerate fibrinolysis via enhancement of plasmin generation. These results suggest that the combination of edoxaban and a TAFIa inhibitor might be beneficial for the treatment of thromboembolic diseases.

Keywords

Fibrinolysis Direct factor Xa inhibitor Thrombin-activatable fibrinolysis inhibitor Edoxaban Combination 

Notes

Funding

This study was financially supported by Daiichi Sankyo Co., Ltd.

Compliance with ethical standards

Conflict of interest

All authors are the employees of Daiichi Sankyo Co., Ltd.

Ethical approval

This was an in vitro investigation and did not involve any living subjects.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Medical Science DepartmentDaiichi Sankyo Co., Ltd.TokyoJapan
  2. 2.Rare Disease LaboratoriesDaiichi Sankyo Co., Ltd.TokyoJapan
  3. 3.End-Organ Disease LaboratoriesDaiichi Sankyo Co., Ltd.TokyoJapan

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